<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>修改字体大小和颜色</title>
    <style type="text/css">
        p {
            font-size: 20px;
            color: red;
        }
    </style>
</head>
<body>
    <p>修改字体大小和颜色</p>
</body>
</html>